Rock-drill.



G. G. HANSEN.

A BOOK DRILL. APPLICATION FILED AUG. 8, 1911.

1,957,732, 7 Patented Apn 1, i913.

unini) STATES ,a'ra a r arson.

estates 0. fiansnit, casserole, rnnNsYLvANm, ASSiGNDIt 'romonnsoaL-aeuncontra-NY, or new roan, N. Y., a oonronarron" or unevenness.

Specification of Letters Patent.

1 ROCK-DRILL.

Patented Apr. t, 1933..

Application flled'August 8, 1911. Serial 170. 643,006.

of Easton, in the county f Northampton and State of Pennsylvania, haveinvented a new and useful Improvement in Rock Drills, of which thefollowing 1s a specification.

This invention relates to rock drills and is directed particularly tothe construction of the drill bit and themeans connectlng it with therock drill.

In the accompanying drawings, Figure 1 represents part y in sideelevation and partly in. section so much of a rock dr ll, drill bit andconnecting parts as will give a clear understanding of the several features of my invention. Fig. 2 is a transverse section taken in theplane of the line AA of Fig. 1, and Fig. 3 is a transverse section takenin the plane of the line B-B of Fig. 1.

The drill bit is denoted by 1, which bit is herein shown as removablvsecured in the lower end of the drill stool Q- by providing- -chuck.8 ofthe work piston rod 9 of the rock drill. An axially arranged verticalpassage 10 is formed in the drill bit 1, from which passage one or moreholes 11 lead outwardly toward the cutting edge of the bit. A checkvalve 12 is provided for this passage 10, which check valve is hereinshown as located in the socket 3 between the upper end of the bit andthe bottom of the socket. An axially arranged passage 13 leads throughthe drill steel 2, the bottom of which passage opens into the socket land the top of which passage opensinto the socket 6 in the shank 5. Thisshank 5 is provided with one or more laterally ara shoulder 16 on theshank 5 and the bottomof the chuck 8, which apron extends down- .wardlybeyond the holes 14 in the chuck for deflecting the water and materialpumped upwardly from the drill bit down along the steel. In the resentinstance, the depending portion of the apron 15 is provided with aflaring socket 17.

In operation; the bit with its steel is re ciprocated in .the usualmanner by the rock drill and water is supplied to the hole beingdrilledin the proper quantity. As the drill is operated, the materialout by the drill bit is forced, together with the water, upwardlythrough the holes 11, passage 10 and passage 13 past the check valve 12.The valve 12 serves to prevent the return of the material through thebit. When the material finally reaches the top of the steel it is forcedout through the holes 14 and de-- flectcd downward by the apron 15 alongthe sides or" the steel,

' The usual practice is to cover the hole being dritled by means of apiece of bagging or burlap or other suitable material which will retainthe coarser cutting material and permit the water to How back again intothe hole. In this manner very little water is needed for the drilloperation as it is used over and over. The use of means for deflectingthewater and material. downwardly not only prevents the loss of thewater by its being expelled to a considerable distance away from thesteel but also serves to permit the operator to stand in close proximityto the drill. It is evident that various changes might be resorted to ithe form, construction and arrangement of the several parts withoutdeparting from the spirit and scope of my invention; hence I do not wishto limit myiclf strictly to the structure herein set forth,

What I claim is:

1. A drill bit. and its steel having a passage for the discharge of theout material, a check valve for said passage and-.an apron for directingthe discharged material down- \vardly along the steel.

2. A drill hit, its steel and shank having a passage forfthe dischargeof the out material, a check valve for said passage and an apronsurrounding the shank for directing the discharged material downwardlyalong the steel.

3. A drill bit, its steel and shank having a passage for the dischargeof the cut matelet holes, and an apron surrounding the shank fordirecting the discharged material downwardly along the steel.

4. A drill bitand its steel having. a pas; sage for the discharge of theen; mat; v In testimony, hat I claim the foregoing and a check valve forsaid passage 3i, i i. f as my invention, I have signed my name in havinga socket for receiving the bit, and; an i presence of two witnesses,this fourth day of 20 aproi' for (lirleciinlg the}(l1schalrged mateyAugust 1911. rial ownwarr 1y a ong tie stee,

5. A drill hit, its steel and shank having CHARLES H a passage for thedischarge of the cut material, a check Yalve for said passage, saidsteel having a socket for receiving the bit and id? having a socket forreceiving the- Skfifil, and an apron surrounding the 15 an in directingthe discharged material v dgo,\ -nwariily alon the steel.

\Vitnesses r F. GEORGE, BARRY, G, S. SUNDGREN.

